import { key } from "./hello";
function sum(num1: number, num2: number): number {
  return num1 + num2;
}
console.log(sum(1, 2));
console.log(key);

const obj = {
  name: "张三",
  age: 18,
};
obj.age = 20;
console.log(obj);

// console.log(Promise);
